hv_netvsc: WARNING in softirq.c

[Richard Genoud]

2013/3/6 Haiyang Zhang <haiyangz at microsoft.com>:
> I have found a simple way to reproduce this kind of warning:
> 1) reboot the VM (because this warning can be displayed only once.)
> 2) login to the host and open the VM [Settings]
> 3) Temporarily change the Network adapter's option [Virtual Switch] to "Not connected".
> 4) run dmesg, you should see the warning.
>
> The reason for the warning is -- netif_tx_disable() is called when the NIC
> is disconnected. And it's called within irq context. netif_tx_disable()
> calls local_bh_enable() which displays warning if in irq.
>
> The fix is to remove the unnecessary netif_tx_disable() in the netvsc_linkstatus_callback().
> I attached a patch. Would you like to test it on your side as well?
>
> Thanks,
> - Haiyang
>
Thanks for your reply.
I'll be able to test your patch in 2 or 3 weeks I guess (I haven't got
any access to the hyperV machine, the admin-sys is on holiday, and
it's a production server... So I don't want to mess with it right now
:) )

Regards,
Richard.